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A construction worker is lifting a load of bricks onto a truck. He does 200 J of work in 40 seconds. What is his power output?
5 W
mechanical efficiency
The object must move in the same direction as the force
friction
compound machine
the direction of a force
500 J
how high the barbell is being lifted
What is machine that is made of two simple machines?
5 W
mechanical efficiency
The object must move in the same direction as the force
friction
compound machine
the direction of a force
500 J
how high the barbell is being lifted
What does a fixed pulley change?
5 W
mechanical efficiency
The object must move in the same direction as the force
friction
compound machine
the direction of a force
500 J
how high the barbell is being lifted
If a barbell weighs 160 N, what other information do you need to calculate how much work it takes to lift it?
5 W
mechanical efficiency
The object must move in the same direction as the force
friction
compound machine
the direction of a force
500 J
how high the barbell is being lifted
What two things must happen for work to be done?
5 W
mechanical efficiency
The object must move in the same direction as the force
friction
compound machine
the direction of a force
500 J
how high the barbell is being lifted
Greg applies a force of 100 N to move a box 5 meters. How much work did he do?
5 W
mechanical efficiency
The object must move in the same direction as the force
friction
compound machine
the direction of a force
500 J
how high the barbell is being lifted
Which of the following causes machines not to be 100% efficienct?
5 W
mechanical efficiency
The object must move in the same direction as the force
friction
compound machine
the direction of a force
500 J
how high the barbell is being lifted
Which of the following is the comparison of a machine's work output with the work input?
5 W
mechanical efficiency
The object must move in the same direction as the force
friction
compound machine
the direction of a force
500 J
how high the barbell is being lifted
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